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Fig. 4.


Stacked M87 jet images and transverse intensity profiles. Panel a: image with a restoring beam of 0:3 × 0:1 mas. The core (C), northern /southern limbs (NL/SL) of the jet (J), and the counter-jet (CJ) are indicated by white arrows. Panel b: as in panel a, but restored with a smaller beam of 0:123 × 0:051 mas and zoomed in on the inner region. The colorbars indicate total intensities in units of Jy beam−1. Contour levels are (−1, 1, 1.4, 2, 2.8, …) × 0.47 mJy beam−1. The white bars indicate projected linear distance scales for M87. The white dashed lines denote the position of the slices in panel c. The restoring beams are indicated by the cyan ellipses in the top left corner of each panel. Panel c: transverse jet intensity profiles measured using the higher resolution image in Fig. 4b (starting from north to south). The dark solid/broken lines are the measured intensity at ~0.8/0.6 mas core distance, respectively. The light gray line is the zero intensity level and the dark thick gray line indicates the 5σ level.

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